book holder
prompter
https://source.unsplash.com/featured/?book-holder#.png
/suto3/google.iconbook holder
/suto3/Google画像検索.iconbook holder
/suto3/Google定義検索.icon book holder
/suto3/wikipedia.iconbook holder
/suto3/weblio.icon book holder
/suto3/kotobank.icon book holder
/suto3/jisho.icon book holder